Oh my strategy was to BFG mobs, to score as many kills as quickly as I could, to increase the chances of invisibility or invulnerability triggering. Then switch to rocket launcher for arch-vile control. Stay moving, if you get a few rockets on your tail, just lure them into enemies. Use the countdown timer on the screen to keep track of how much invulnerability you have left (it lasts 30 seconds) so you know when to BFG the mob again to try and re-trigger it. It'll pop eventually.
ajb1978
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